Lightning-arrester



(No Model.)

G. D. HOOP. LIGNITNING ARRBSTER.

v No. 436,238. Patented Sept. 9, 1890.

WITNESSES.-

INVENTOR:

ATTORNEYS UNITED STATES PATENT OFFICE.

GEORGE D. HOOP, OFJAOKSON, OHIO.

LIGHTNING-ARRESTER.

SPECIFICATION forming part of Letters Patent No. 436,238, dated September 9, 1890.

Application filed July '7, 1890- Seriul No. 357,964 (No model.)

To all whom it may concern:

Be it known that I, GEORGE D. HOOP, of Jackson, in the county of Jackson and State of Ohio, have invented a new and Improved Lightning-Arrester, of which the followingis a specification, reference being had to the annexed drawings, forming a part thereof, in which Figure 1 is a front elevation of my improved lightning-arrester, and Fig. 2 is a longitudinal section taken on line 2 2 in Fig. 1.

Similar letters of reference indicate corresponding parts in both views.

The object of my invention is to provide a simple and effioient arrester for attachment to dynamo-circuits, more especially for use in connection with the electric-lighting circuits.

My invention consists in the construction and arrangement of parts hereinafter described and claimed.

To the insulated base-piece A are attached the metallic plates a a a The said plates are provided with bindingscrews b b b for receiving the wires 0 0 c communicating with the circuits to be protected. A plate B, provided with apertures cl cl 01 is secured to the base-piece A, and in these apertures are arranged serrated disks 6 6 c with their points equally distant from but not touching the plate 13. The serrated disks are provided at their centers with contact-buttons ff f which receive the fusible wires g g g communicating with the plates a a 60 To a plate 0, secured to the base-piece A, parallel to the plate B, are pivoted the switcharms h h M which are connected by an insulating-bar "6, by means of which the said switch-arms may be moved so as to briu g them into contact with the contact-buttons ff f or with the contact-buttonsjj 7' projecting from the apertured plate B.

To the plate O are attached binding-posts D D for receiving the ground-Wires E E.

WVhile the circuits are charged with the current from the dynamos, the switch-arms h h 71. are allowed to rest upon the contactbuttons j j 7' If either circuit is struck by lightning while in operation, (the one connected with the wire 0, for example) the charge passes to the plate a, thence to the serrated disk ethrough the wire g. Leaping across the space between the serrated disk and the plate B, it passes over the plate B, over the switch-arms h h 77. to the plate 0, thence through the ground-wires E E to the ground. When the circuits are not in use, the switch-arms h h k are moved so as to bring them into contact with the buttons ff f thus establishing a direct metallic communication between the wires 0 c c and the ground-wires E E. The charge then passes directly to the switch-arms without leaping across the space between the serrated disks and the plate 13. If while the switch-arms arearranged as last described the dynamos are inserted, the grounding of the circuits is prevented by the melting of the safety-wire belonging to the circuit. A melted safetywire is readily replaced by a ew one.

By employing the serratec disks and the apert-ured plate B a large number of discharge-points are provided for the escape of lightning from the circuits to the ground Without danger of grounding the circuits.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In alightning-arrester, the combination, with an insulated serrated disk having a fusible line-wire connection and a contactpoint, of an insulated plate having an aperture receiving the said disk and a contact point, and a switch having a ground-connection and adapted to swing from one of said contact-points to the other, substantially as described.

2. In a lightning-arrester, the combination of an insulating base-piece A, a metallic plate a, a serrated disk 6, a fusible Wire g, connecting the plate a and serrated disk 6, an apertured plate B, surrounding the serrated disk e, and a switch It for making direct connection between the plate B and the ground or the serrated disk e and the ground, substantially as specified.

3. A lightning-arrester, comprising the base A of insulating material, the plates at a a thereon, provided with line-wire connections, the plate B, having a series of apertures and contact-points j jj the serrated disks 6 e e within said apertures and provided withcontact-points f f f fusible wires connecting plates a a a with the said disks, the grounded plate 0, having three switches h h 77.2, and a-connecting-bar 2' to operate them simultaneously, substantially as described.

GEORGE D. HOOP.

Witnesses:

JOHN D. Onossnnnn, J. J. MOKITTERIOK. 

